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Closure Report •IP, h <br /> Golden Grain Manteca Bean Facili ,..Moffat Boulevard,Manteca,Califomia July 16,19% <br /> 1 <br /> CONTENTS <br /> ' 1 0 INTRODUCTION 1 <br /> 11 Background 1 <br /> 1 1 1 Underground Tank Removal 2 <br /> ' 1 12 Sampling and Treatment System 2 <br /> 1 1 3 Operating Permits 3 <br /> ' 2 0 SITE CHARACTERIZATION 3 <br /> 21 Geology/Hydrogeology 4 <br /> 22 Baseline Site Conditions 5 <br /> ' 2 2 1 Extent of Hydrocarbon Impacted Soil 5 <br /> 2 2 2 Extent of Hydrocarbon Impacted Groundwater 6 <br /> 2 2 3 One-Half Mile Well Survey, Beneficial Uses, Groundwater Objectives 7 <br /> 3 0 SITE REMEDIATION 8 <br /> 31 Feasibility Evaluation 8 <br /> 32 Treatment System 9 <br /> 3 2 1 Treatment System Operation 10 <br /> 33 Remediation System Effectiveness 11 <br /> 3 3 1 Soil Vapor Extraction 12 <br /> 3 3 2 Groundwater Extraction 13 <br /> ' 4 0 CURRENT SITE CONDITIONS 13 <br /> 41 Soil Boring Program 14 <br /> 4 1 1 Soil Results 14 <br /> 4 1 2 Chemical Analysis of Groundwater Samples 15 <br /> 4 1 3 Soil Vapor Extraction Test 15 <br /> 4 1 4 Physical Properties Analysis of Soil Samples 16 <br /> 42 Current Groundwater Conditions 16 <br /> ' <br /> 43 Summary of Current Site Conditions 17 <br /> 4 3 1 Current Extent of Hydrocarbon Impacted Soil 17 <br /> 4 3 2 Current Extent of Hydrocarbon Impacted Groundwater 17 <br /> ' 44 Overall Summary of Baseline and Existing Site Conditions 18 <br /> 50 HYDROGEOLOGIC MODELING 19 <br /> ' <br /> 51 Modeling Approach 19 <br /> 52 Model Input and Assumptions 20 <br /> 5 2 1 Advection 20 <br /> ' <br /> 522 Dispersion 21 <br /> 523 Sorption 21 <br /> 524 Biodegradation 23 <br /> ' 53 Results of Hydrogeological Model 24 <br /> 42020213.CR <br /> J FLUOR DANIEL 611 �5- <br />